From b9c430129d5971df4410b6c829b100ce8191328e Mon Sep 17 00:00:00 2001
From: Peter Todd <pete@petertodd.org>
Date: Wed, 8 May 2019 22:38:58 -0400
Subject: [PATCH] Inline some Cursor calls for slices

(Partially) brings back https://github.com/rust-lang/rust/pull/33921
---
 src/libstd/io/cursor.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/libstd/io/cursor.rs b/src/libstd/io/cursor.rs
index 64f8659b8f8fe..f627fb0f562f0 100644
--- a/src/libstd/io/cursor.rs
+++ b/src/libstd/io/cursor.rs
@@ -265,6 +265,7 @@ impl<T> BufRead for Cursor<T> where T: AsRef<[u8]> {
 }
 
 // Non-resizing write implementation
+#[inline]
 fn slice_write(pos_mut: &mut u64, slice: &mut [u8], buf: &[u8]) -> io::Result<usize> {
     let pos = cmp::min(*pos_mut, slice.len() as u64);
     let amt = (&mut slice[(pos as usize)..]).write(buf)?;
@@ -272,6 +273,7 @@ fn slice_write(pos_mut: &mut u64, slice: &mut [u8], buf: &[u8]) -> io::Result<us
     Ok(amt)
 }
 
+#[inline]
 fn slice_write_vectored(
     pos_mut: &mut u64,
     slice: &mut [u8],
@@ -341,6 +343,7 @@ impl Write for Cursor<&mut [u8]> {
         slice_write_vectored(&mut self.pos, self.inner, bufs)
     }
 
+    #[inline]
     fn flush(&mut self) -> io::Result<()> { Ok(()) }
 }
 
@@ -354,6 +357,7 @@ impl Write for Cursor<&mut Vec<u8>> {
         vec_write_vectored(&mut self.pos, self.inner, bufs)
     }
 
+    #[inline]
     fn flush(&mut self) -> io::Result<()> { Ok(()) }
 }
 
@@ -367,6 +371,7 @@ impl Write for Cursor<Vec<u8>> {
         vec_write_vectored(&mut self.pos, &mut self.inner, bufs)
     }
 
+    #[inline]
     fn flush(&mut self) -> io::Result<()> { Ok(()) }
 }
 
@@ -382,6 +387,7 @@ impl Write for Cursor<Box<[u8]>> {
         slice_write_vectored(&mut self.pos, &mut self.inner, bufs)
     }
 
+    #[inline]
     fn flush(&mut self) -> io::Result<()> { Ok(()) }
 }